数字签名的实际意义应该被理解为：“声称有某某电子邮件地址的人证明了他有这个文件，并且此后此文件未被更改过。”
The actual meaning of the digital signature should be understood as: "a person who claims to have such and such E-mail address certified this file, and it hasn't changed since then."
记住网络内外可能希望使用的所有计算机的IP地址数字显然是不切实际的。
Remembering Numbers for all of the machines that you might want to use both inside and outside of your network is obviously impractical.
在幕后，实际的地址是一个数字串(在互联网协议被称为IP地址)，看起来像这样：74.125.53.100。
Behind the scenes, the actual address is a string of Numbers (called an I.P. address, for Internet protocol) that looks something like this: 74.125.53.100.
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